diff options
Diffstat (limited to 'lib/ssh/src/ssh_cli.erl')
| -rw-r--r-- | lib/ssh/src/ssh_cli.erl | 311 |
1 files changed, 187 insertions, 124 deletions
diff --git a/lib/ssh/src/ssh_cli.erl b/lib/ssh/src/ssh_cli.erl index 958c342f5f..af51356355 100644 --- a/lib/ssh/src/ssh_cli.erl +++ b/lib/ssh/src/ssh_cli.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2005-2017. All Rights Reserved. +%% Copyright Ericsson AB 2005-2018. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. @@ -25,14 +25,16 @@ -module(ssh_cli). --behaviour(ssh_daemon_channel). +-behaviour(ssh_server_channel). -include("ssh.hrl"). -include("ssh_connect.hrl"). -%% ssh_channel callbacks +%% ssh_server_channel callbacks -export([init/1, handle_ssh_msg/2, handle_msg/2, terminate/2]). +-export([dbg_trace/3]). + %% state -record(state, { cm, @@ -45,23 +47,8 @@ }). %%==================================================================== -%% ssh_channel callbacks +%% ssh_server_channel callbacks %%==================================================================== --spec init(Args :: term()) -> - {ok, State :: term()} | {ok, State :: term(), timeout() | hibernate} | - {stop, Reason :: term()} | ignore. - --spec terminate(Reason :: (normal | shutdown | {shutdown, term()} | - term()), - State :: term()) -> - term(). - --spec handle_msg(Msg ::term(), State :: term()) -> - {ok, State::term()} | {stop, ChannelId::integer(), State::term()}. --spec handle_ssh_msg({ssh_cm, ConnectionRef::term(), SshMsg::term()}, - State::term()) -> {ok, State::term()} | - {stop, ChannelId::integer(), - State::term()}. %%-------------------------------------------------------------------- %% Function: init(Args) -> {ok, State} @@ -118,42 +105,53 @@ handle_ssh_msg({ssh_cm, ConnectionHandler, write_chars(ConnectionHandler, ChannelId, Chars), {ok, State#state{pty = Pty, buf = NewBuf}}; -handle_ssh_msg({ssh_cm, ConnectionHandler, - {shell, ChannelId, WantReply}}, State) -> +handle_ssh_msg({ssh_cm, ConnectionHandler, {shell, ChannelId, WantReply}}, State) -> NewState = start_shell(ConnectionHandler, State), - ssh_connection:reply_request(ConnectionHandler, WantReply, - success, ChannelId), - {ok, NewState#state{channel = ChannelId, - cm = ConnectionHandler}}; - -handle_ssh_msg({ssh_cm, ConnectionHandler, - {exec, ChannelId, WantReply, Cmd}}, #state{exec=undefined, - shell=?DEFAULT_SHELL} = State) -> - {Reply, Status} = exec(Cmd), - write_chars(ConnectionHandler, - ChannelId, io_lib:format("~p\n", [Reply])), - ssh_connection:reply_request(ConnectionHandler, WantReply, - success, ChannelId), - ssh_connection:exit_status(ConnectionHandler, ChannelId, Status), - ssh_connection:send_eof(ConnectionHandler, ChannelId), - {stop, ChannelId, State#state{channel = ChannelId, cm = ConnectionHandler}}; - -handle_ssh_msg({ssh_cm, ConnectionHandler, - {exec, ChannelId, WantReply, _Cmd}}, #state{exec = undefined} = State) -> - write_chars(ConnectionHandler, ChannelId, 1, "Prohibited.\n"), ssh_connection:reply_request(ConnectionHandler, WantReply, success, ChannelId), - ssh_connection:exit_status(ConnectionHandler, ChannelId, 255), - ssh_connection:send_eof(ConnectionHandler, ChannelId), - {stop, ChannelId, State#state{channel = ChannelId, cm = ConnectionHandler}}; - -handle_ssh_msg({ssh_cm, ConnectionHandler, - {exec, ChannelId, WantReply, Cmd}}, State) -> - NewState = start_shell(ConnectionHandler, Cmd, State), - ssh_connection:reply_request(ConnectionHandler, WantReply, - success, ChannelId), {ok, NewState#state{channel = ChannelId, cm = ConnectionHandler}}; +handle_ssh_msg({ssh_cm, ConnectionHandler, {exec, ChannelId, WantReply, Cmd}}, S0) -> + case + case S0#state.exec of + {direct,F} -> + %% Exec called and a Fun or MFA is defined to use. The F returns the + %% value to return. + exec_direct(ConnectionHandler, F, Cmd); + + undefined when S0#state.shell == ?DEFAULT_SHELL -> + %% Exec called and the shell is the default shell (= Erlang shell). + %% To be exact, eval the term as an Erlang term (but not using the + %% ?DEFAULT_SHELL directly). This disables banner, prompts and such. + exec_in_erlang_default_shell(Cmd); + + undefined -> + %% Exec called, but the a shell other than the default shell is defined. + %% No new exec shell is defined, so don't execute! + %% We don't know if it is intended to use the new shell or not. + {"Prohibited.", 255, 1}; + + _ -> + %% Exec called and a Fun or MFA is defined to use. The F communicates via + %% standard io:write/read. + %% Kept for compatibility. + S1 = start_exec_shell(ConnectionHandler, Cmd, S0), + ssh_connection:reply_request(ConnectionHandler, WantReply, success, ChannelId), + {ok, S1} + end + of + {Reply, Status, Type} -> + write_chars(ConnectionHandler, ChannelId, Type, Reply), + ssh_connection:reply_request(ConnectionHandler, WantReply, success, ChannelId), + ssh_connection:exit_status(ConnectionHandler, ChannelId, Status), + ssh_connection:send_eof(ConnectionHandler, ChannelId), + {stop, ChannelId, S0#state{channel = ChannelId, cm = ConnectionHandler}}; + + {ok, S} -> + {ok, S#state{channel = ChannelId, + cm = ConnectionHandler}} + end; + handle_ssh_msg({ssh_cm, _ConnectionHandler, {eof, _ChannelId}}, State) -> {ok, State}; @@ -259,35 +257,7 @@ to_group(Data, Group) -> end, to_group(Tail, Group). -exec(Cmd) -> - case eval(parse(scan(Cmd))) of - {error, _} -> - {Cmd, 0}; %% This should be an external call - Term -> - Term - end. - -scan(Cmd) -> - erl_scan:string(Cmd). - -parse({ok, Tokens, _}) -> - erl_parse:parse_exprs(Tokens); -parse(Error) -> - Error. - -eval({ok, Expr_list}) -> - case (catch erl_eval:exprs(Expr_list, - erl_eval:new_bindings())) of - {value, Value, _NewBindings} -> - {Value, 0}; - {'EXIT', {Error, _}} -> - {Error, -1}; - Error -> - {Error, -1} - end; -eval(Error) -> - {Error, -1}. - +%%-------------------------------------------------------------------- %%% io_request, handle io requests from the user process, %%% Note, this is not the real I/O-protocol, but the mockup version %%% used between edlin and a user_driver. The protocol tags are @@ -506,53 +476,130 @@ bin_to_list(L) when is_list(L) -> bin_to_list(I) when is_integer(I) -> I. + +%%-------------------------------------------------------------------- start_shell(ConnectionHandler, State) -> - Shell = State#state.shell, - ConnectionInfo = ssh_connection_handler:connection_info(ConnectionHandler, - [peer, user]), - ShellFun = case is_function(Shell) of - true -> - User = proplists:get_value(user, ConnectionInfo), - case erlang:fun_info(Shell, arity) of - {arity, 1} -> - fun() -> Shell(User) end; - {arity, 2} -> - {_, PeerAddr} = proplists:get_value(peer, ConnectionInfo), - fun() -> Shell(User, PeerAddr) end; - _ -> - Shell - end; - _ -> - Shell - end, - Echo = get_echo(State#state.pty), - Group = group:start(self(), ShellFun, [{echo, Echo}]), - State#state{group = Group, buf = empty_buf()}. - -start_shell(_ConnectionHandler, Cmd, #state{exec={M, F, A}} = State) -> - Group = group:start(self(), {M, F, A++[Cmd]}, [{echo, false}]), - State#state{group = Group, buf = empty_buf()}; -start_shell(ConnectionHandler, Cmd, #state{exec=Shell} = State) when is_function(Shell) -> - - ConnectionInfo = ssh_connection_handler:connection_info(ConnectionHandler, - [peer, user]), - User = proplists:get_value(user, ConnectionInfo), - ShellFun = - case erlang:fun_info(Shell, arity) of - {arity, 1} -> - fun() -> Shell(Cmd) end; - {arity, 2} -> - fun() -> Shell(Cmd, User) end; - {arity, 3} -> - {_, PeerAddr} = proplists:get_value(peer, ConnectionInfo), - fun() -> Shell(Cmd, User, PeerAddr) end; - _ -> - Shell - end, - Echo = get_echo(State#state.pty), - Group = group:start(self(), ShellFun, [{echo,Echo}]), - State#state{group = Group, buf = empty_buf()}. + ShellSpawner = + case State#state.shell of + Shell when is_function(Shell, 1) -> + [{user,User}] = ssh_connection_handler:connection_info(ConnectionHandler, [user]), + fun() -> Shell(User) end; + Shell when is_function(Shell, 2) -> + ConnectionInfo = + ssh_connection_handler:connection_info(ConnectionHandler, [peer, user]), + User = proplists:get_value(user, ConnectionInfo), + {_, PeerAddr} = proplists:get_value(peer, ConnectionInfo), + fun() -> Shell(User, PeerAddr) end; + {_,_,_} = Shell -> + Shell + end, + State#state{group = group:start(self(), ShellSpawner, [{echo, get_echo(State#state.pty)}]), + buf = empty_buf()}. + +%%-------------------------------------------------------------------- +start_exec_shell(ConnectionHandler, Cmd, State) -> + ExecShellSpawner = + case State#state.exec of + ExecShell when is_function(ExecShell, 1) -> + fun() -> ExecShell(Cmd) end; + ExecShell when is_function(ExecShell, 2) -> + [{user,User}] = ssh_connection_handler:connection_info(ConnectionHandler, [user]), + fun() -> ExecShell(Cmd, User) end; + ExecShell when is_function(ExecShell, 3) -> + ConnectionInfo = + ssh_connection_handler:connection_info(ConnectionHandler, [peer, user]), + User = proplists:get_value(user, ConnectionInfo), + {_, PeerAddr} = proplists:get_value(peer, ConnectionInfo), + fun() -> ExecShell(Cmd, User, PeerAddr) end; + {M,F,A} -> + {M, F, A++[Cmd]} + end, + State#state{group = group:start(self(), ExecShellSpawner, [{echo,false}]), + buf = empty_buf()}. + +%%-------------------------------------------------------------------- +exec_in_erlang_default_shell(Cmd) -> + case eval(parse(scan(Cmd))) of + {ok, Term} -> + {io_lib:format("~p\n", [Term]), 0, 0}; + {error, Error} when is_atom(Error) -> + {io_lib:format("Error in ~p: ~p\n", [Cmd,Error]), -1, 1}; + _ -> + {io_lib:format("Error: ~p\n", [Cmd]), -1, 1} + end. + +scan(Cmd) -> + erl_scan:string(Cmd). + +parse({ok, Tokens, _}) -> + erl_parse:parse_exprs(Tokens); +parse(Error) -> + Error. +eval({ok, Expr_list}) -> + case (catch erl_eval:exprs(Expr_list, + erl_eval:new_bindings())) of + {value, Value, _NewBindings} -> + {ok, Value}; + {'EXIT', {Error, _}} -> + {error, Error}; + {error, Error} -> + {error, Error}; + Error -> + {error, Error} + end; +eval({error,Error}) -> + {error, Error}; +eval(Error) -> + {error, Error}. + +%%-------------------------------------------------------------------- +exec_direct(ConnectionHandler, ExecSpec, Cmd) -> + try + case ExecSpec of + _ when is_function(ExecSpec, 1) -> + ExecSpec(Cmd); + _ when is_function(ExecSpec, 2) -> + [{user,User}] = ssh_connection_handler:connection_info(ConnectionHandler, [user]), + ExecSpec(Cmd, User); + _ when is_function(ExecSpec, 3) -> + ConnectionInfo = + ssh_connection_handler:connection_info(ConnectionHandler, [peer, user]), + User = proplists:get_value(user, ConnectionInfo), + {_, PeerAddr} = proplists:get_value(peer, ConnectionInfo), + ExecSpec(Cmd, User, PeerAddr) + end + of + Reply -> + return_direct_exec_reply(Reply, Cmd) + catch + C:Error -> + {io_lib:format("Error in \"~s\": ~p ~p~n", [Cmd,C,Error]), -1, 1} + end. + + + +return_direct_exec_reply(Reply, Cmd) -> + case fmt_exec_repl(Reply) of + {ok,S} -> + {S, 0, 0}; + {error,S} -> + {io_lib:format("Error in \"~s\": ~s~n", [Cmd,S]), -1, 1} + end. + +fmt_exec_repl({T,A}) when T==ok ; T==error -> + try + {T, io_lib:format("~s",[A])} + catch + error:badarg -> + {T, io_lib:format("~p", [A])}; + C:Err -> + {error, io_lib:format("~p:~p~n",[C,Err])} + end; +fmt_exec_repl(Other) -> + {error, io_lib:format("Bad exec-plugin return: ~p",[Other])}. + +%%-------------------------------------------------------------------- % Pty can be undefined if the client never sets any pty options before % starting the shell. get_echo(undefined) -> @@ -578,3 +625,19 @@ not_zero(0, B) -> not_zero(A, _) -> A. +%%%################################################################ +%%%# +%%%# Tracing +%%%# + +dbg_trace(points, _, _) -> [terminate]; + +dbg_trace(flags, terminate, _) -> [c]; +dbg_trace(on, terminate, _) -> dbg:tp(?MODULE, terminate, 2, x); +dbg_trace(off, terminate, _) -> dbg:ctpg(?MODULE, terminate, 2); +dbg_trace(format, terminate, {call, {?MODULE,terminate, [Reason, State]}}) -> + ["Cli Terminating:\n", + io_lib:format("Reason: ~p,~nState:~n~s", [Reason, wr_record(State)]) + ]. + +?wr_record(state). |